hitunglah keliling dan luas suatu lingkaran jika jari jari nya a. 72 cm b.25 cm c. d=35 cm d. d=18 cm

Semoga membantu.............

a. Jari jari : 72 cm

LUAS

=Phi×r×r

[tex] = 3.14 \times 72 \times 72[/tex]

16277,76 cm^2

KELILING

=Phi×D

[tex]3.14 \times 144[/tex]

=452,16 cm

b. Jari jari : 25 cm

LUAS

=Phi×r×r

[tex] = 3.14 \times 25 \times 25[/tex]

= 1962,5 cm^2

KELILING

=Phi×D

[tex] = 3.14 \times 50[/tex]

=157 cm

c. Diameter : 35 cm
Jari - Jari : 17.5 cm

LUAS

= Phi×r×r

[tex] = \frac{22}{7} \times 17.5 \times 17.5[/tex]

= 962,5 cm^2

KELILING

=Phi×D

[tex] = \frac{22}{7} \times 35[/tex]
=110 cm

d. Diameter : 18 cm
Jari jari : 9 cm

LUAS

=Phi×r×r

=3,14×9×9

=254,34 cm^2

KELILING

=Phi×D

=3,14×18

=56,25 cm

Semoga membantu
-Indah